Dense Plasma Torus in the GPS Galaxy NGC 1052

Abstract

We report results from nearly simultaneous pentachromatic VLBI observations towa rds a nearby GPS galaxy NGC 1052. The observations at 1.6 and 4.8 GHz with VSOP, and at 2.3, 8.4, and 15.4 GHz wit h VLBA, provide linear resolutions of $\sim 0.1$ pc. Convex spectra of a double-sided jet imply that synchrotron emission is obscured through foreground cold dense plasma, in terms of free--free absorption (FFA). We found a central condensation of the plasma which covers about 0.1 pc and 1 pc of the approaching and receding jets, respectively. A simple model with a geometrically thick plasma torus perpendicular to the jets is established to explain the asymmetric distribution of FFA opacities.

9 pages, 4 figures, other comments

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Cited by in corpus (14)

• Compact steep-spectrum and peaked-spectrum radio sources
• The Twin--Jet System in NGC 1052: VLBI-Scrutiny of the Obscuring Torus
• The VSOP 5-GHz AGN Survey: IV. The Angular Size/Brightness Temperature Distribution
• The Two-sided Jet Structures of NGC 1052 at Scales from 300 to $4\times 10^7$ Schwarzschild Radii
• VIMAP: an Interactive Program Providing Radio Spectral Index Maps of Active Galactic Nuclei
• Numerical calculations of spectral turnover and Synchrotron Self Absorption in CSS and GPS radio sources
• Using evolutionary algorithms to model relativistic jets: Application to NGC 1052
• A Massive Molecular Torus inside a Gas-Poor Cirnumnuclear Disk in the Radio Galaxy NGC 1052 Discovered with ALMA
• Radiation pressure confinement -- V. The predicted free-free absorption and emission in active galactic nuclei
• The putative center in NGC 1052
• A broad HCO+ absorption line associated with the circumnuclear torus of NGC 1052
• Probing Jet-Torus Interaction in the Radio Galaxy NGC 1052 by Sulfur-Bearing Molecules
• ALMA Detection of 321 GHz water maser emission in the radio galaxy NGC 1052
• H_2O maser and a plasma obscuring torus in the radio galaxy NGC 1052